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Rayy, also spelled Ray, Rey, or Rai, Old Persian Ragha, Latin Rhagae, formerly one of the great cities of Iran. The remains of the ancient city lie on the eastern outskirts of the modern city of Shahr-e-Rey, which itself is located just a few miles southeast of Tehrān.

A settlement at the site dates from the 3rd millennium bc. Rayy is featured in the Avesta (the original document of Zoroastrianism, an Iranian religion) as a sacred place, and it is also mentioned in the book of Tobit, of the biblical Apocrypha, and by classical authors. Rayy was captured by the Muslim Arabs in ad 641. During the reign of the Muslim caliph al-Mahdī in the 8th century, the city grew in importance until it was rivaled in western Asia only by Damascus and Baghdad. Islamic writers described it as a city of extraordinary beauty, built largely of fired brick and brilliantly ornamented with blue faience (glazed earthenware). It continued to be an important city under the rule of the Seljuqs, but in the 12th century it was weakened by the fierce quarrels of rival religious sects. In 1220 the city was almost entirely destroyed by the Mongols, and its inhabitants were massacred. Most of the survivors of the massacre moved to nearby Tehrān, and the deserted remnants of Rayy soon fell into complete ruin.

Rayy was famous for its decorated silks, of unsurpassed artistic perfection, and for ceramics. Only two architectural monuments survive: the tower of Toghrïl (1139) and a partially ruined tower.

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